Truing attachment for grinding machines



Julfy 15, 193., s, c, PRQBERT Er AL 1,770,711

TRUING ATTACHMENT FOR GRINDING MACHINES 1 Original Filed Oct. 10, 1924 2 Sheets-Sheet l Jamey C Probe/-21 a? Robert E. Spa/v $515 attain: S

July 15, 193%. s. c. PROBERT ET TRUING ATTACHMENT FOR GRINDING MACHINES 2 Sheets-Sheet 2 Original Filed Oct. 10, 1924 amoentoz mney CP/oert f Robert E. Spa/"r ras Ar- ENT our lsrnm c. rnonnnr Ami nonanr n. sruan, orrnrnoir, MICHIGAN, ASSIGNORS, B r census Assremrnms, T cnarsnnn CORPORATION, A conronarron or DELA- original application filed October 10, 1924, Serial No.

This invention relates to machines, and more particularly to truingat cation,

tachm'ents for grinding discs thereon. This application is adivision of our earlier. appli- Serial' No. 742,770, filed October 10, 1924.

The invention is particularly designed-to be applied to machines for grinding'twist drills. Certain features thereof, however,

are not limited to drill grinding machines but may be agpulied with advantage to other grindin mac es. It is 'ghly important in grinding twist I drills that the drill should be-accurately rnume' arraonmmrron GRINDING mac'nmns 742,770. Divided and this application filed October 5, 1927. Serial No. 224,121.

Figure 1 is a view in front elevation of a portion of a drill grindin machine provided with truing devices 'embo ying the invention;

Figure 2 is a view in side elevation illustrating the mechanism for truing up one of the grinding disc's looking from the left of Figure 1; and

Figure 3 is a view'in side elevation illusground accordin tocertain specifications in "-tratingthe devices for truing up the other of contact with the disc and is also order that the drill may cut with the proper speed and accuracy. In order to grind a drill accurately, the grinding surfaces of the .grinding members should be kept accurately discs of drill grinding" machines are usually provided with a train mechanism for truing up'the ces'of the grinding discs. Such atruing mecha'nism usuall comprises a tr tool which is adjusta le toward and fro the grinding surface of the grinding disc to bring the toolinto and out adjustable across such surface in. a dir'ectionsub stantially parallel therewith sothat thetool Eay traverse the surface- 110fthe, The principal ob'ect of the. present invention is to improve t e construction and mode of operation oftruing mechanisma for truing up thesurfaees of grinding to provide an improved inechanmn the;

ad'ustments re' uired-tob the trg tool' indo contact wiiih the surface" of the disc and to cause the toolto traverse said grinding surface, may be'quicklymnd accurately efiected' i I With this object in view, the invention consists in at'ruing mechanism involving the novel and im roved features, constructions and combinations of parts hereinafter dew-V scribed and particularly pointedout in theclaims, the advantages of which will be read-- ily understood and appreciated 'by those sln'lledinthe art. L v

grinding disc looln'ng from the right of Figure 1.

The machine embodying the present invention as illustratedin the drawings, comprises a0. true. To. secure this result, the grinding" two rotary grinding discs 2 and 4 secured to the opposite ends of a shaft 6 mounted in bearings 8 formed on a bracket 10 secured to the upper end of a standard or bench of usual form. U belt pulley 14 a ut which passes asuitable driving belt (not shown). Each of the grinding discs is provided with a central recess extending inwardly from the outer facehof the'disc, as indicated in dotted lines. 7 The tool for truing up the grinding disc 2 is indicated at 170. This tool is supported in position to engage the outer lateral face of the disc adjacent its periphely with which the drills are engaged in. ing the same. The tool 170 is secureg iii a laterally extending arm on aj slide 172 arranged to'slide in a direction transverse to the .plane of the disc'and prefer: ably perpendicular to sai 172is supportedon a slide 174 mhlintedv to slide on the frame of the machinapreferahly ina direction substantially parallel with the' grinding disc. The movement the slide 174 carries the actin'gend of the a directool across the surface to betr'uedin 'tion substantially radial to the y The slide 172is adjjasted by mechanism on the shaft-6 is mounted a of position toengage thelateral'face do within the l comprising a shaft 176 rotatably mounted in the slide and held from longitudinal movement therein, the inner end of which shaft is threaded into the slide-174. The shaft 176 has a hand wheel 177 secured to the outer end thereof to enable the shaft to be rotated manually.

The slide 174 is adjusted by mechanism comprising a shaft 180 rotatably mounted in the slide and.held from longitudinal movement therein, the inner end of which shaft is threaded into the frame of the machine.

The shaft 180 carries a hand wheel 181 secured to its upper end. The truing tool for truing up the grinding disc 4 is indicated at 182 (Figure 3).

This truing tool is supported in position to engage the periphery of the grinding disc 4. The tool is secured in an arm on a slide 184: arranged to slide in a direction transverse to the plane of the grinding disc and preferably perpendicular to said plane. The slide 184 is mounted on a second slide 186 arranged to slide in a direction preferably parallel with the plane of the grinding disc. The movement of the slide 186 carries the grinding tool into and out of engagement with the periphery of the grinding disc and the movement of the slide 184 carries the acting end of the tool across the peripheral surface of said disc. The slide 184 is adjusted by a mechanism comprising a shaft 188 rotatably mounted in said slide and held from longitudinal movement therein, the inner end of which shaft is threaded into the slide 186. A hand wheel 190 is secured to the outer end of the shaft 188 to enable the same to be manually rotated. The slide 186 is adjusted by a mechanism comprising a shaft 192 rotatably mounted in the slide 186 and held from longitudinal movement therein, the inner end of which shaft is threaded into the frame of the machine. A hand wheel 194 is secured to the up r end of the shaft 192.

To enable the ateral face of the grinding disc 4 to be trued up if desired, the slide 184 is provided with an arm in which may be secured a second truing tool 196 arranged to engage the lateral face of the grinding disc. This tool may be adjusted in a direction transverse to the plane of the grinding disc and in a direction radial to the disc by adjustment of the hand. wheels 190 and 194 respectively. as It is'to beunderstoodthat the invention is not limited- .to the particular construction andJrrangement ofparts of the illustrated embodiment of the invention but that the inv.ention,may. .be. embodied in other forms a v "cf-theclaim Whatischm ed unwi 1 A machine'having in combinations grindingwheel to be trued; truing tools one forthe face of 'the wheel and anas other for'the periphery'thereofland mechanism for so moving said tools that the truing movement of each tool serves to adjust the other tool towards or away from its eon-. tact with the wheel.

2. A grinding machine having in combination a grinding wheel to be trued, a truing tool, a mounting therefor arran ed to carry the tool radially into contact wit the lateral face of the wheel, a second truing tool, a mounting therefor arranged to carry the second tool into contact with the periphery of the wheel, said mountings being'so inter-connected that the movement of one tool across the lateral face of the wheel moves the other tool towards or away from contact with the periphery of the wheel.

9 3. A grinding machine havin in combination a rotary grinding disc, a s 'de mounted for movement in a direction substantially parallel with one face of the grinding disc, :1 second slide mounted on the first slide for movement in a direction substantially arallel with another faceof the grinding disc, a truing tool for one face and a second truingtool for the other face both mounted on the latter slide in such relation that one tool is carried into or away from operative contact with its face of the wheel by the same movement which carries the other tool across its face of the wheel in a truing operation.

'4. A grinding machine having n combinationa grinding wheel, a truing tool for one face of the wheel, another truing tool for another face of the wheel, and a single carriage for said tools capable of movi in di- 10 rections respectively parallel to the aces of the wheel which are to be trued, said tools being connected to the carriage in such relation that one tool is brought into operative contact with its face of the wheel at the end 5 of the movement by which the other tool is caused to true its face of the wheel.

Signed at Detroit, Michigan, this 29th day of September, 1927 

